Objective-C

Download an FTP File to a Stream

Demonstrates the Chilkat Ftp2.GetFileToStream method, which downloads a remote file and writes its bytes to a Stream. The first argument is the remote file path and the second is the Stream, which must have a destination sink configured beforehand.

Note: The local paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Streaming to a Stream object decouples the download from where the bytes ultimately go — a file (as here, via SinkFile), or a pipe feeding another component such as a decompressor or a hashing routine — and processes the data as it arrives rather than buffering the whole file. That keeps memory flat for large downloads and lets you chain the transfer into a processing pipeline.

Chilkat Objective-C Downloads

Download Chilkat for Objective-C

Objective-C

#import <CkoFtp2.h>
#import <CkoStream.h>

BOOL success = NO;

//  Demonstrates the Ftp2.GetFileToStream method, which downloads a remote file and writes its
//  bytes to a Stream.  The 1st argument is the remote file path and the 2nd is the Stream.

CkoFtp2 *ftp = [[CkoFtp2 alloc] init];

ftp.Hostname = @"ftp.example.com";
ftp.Username = @"myFtpLogin";

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
ftp.Password = @"myPassword";

success = [ftp Connect];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

//  Configure the stream's destination sink before downloading.  Here the stream writes to a
//  local file.
CkoStream *fileStream = [[CkoStream alloc] init];
fileStream.SinkFile = @"qa_output/report.pdf";

success = [ftp GetFileToStream: @"public_html/report.pdf" to: fileStream];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

NSLog(@"%@",@"Downloaded to stream.");

success = [ftp Disconnect];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}